CN104818375A - Heat treatment process for strengthening and toughening large wind power flange forgings - Google Patents
Heat treatment process for strengthening and toughening large wind power flange forgings Download PDFInfo
- Publication number
- CN104818375A CN104818375A CN201510270449.4A CN201510270449A CN104818375A CN 104818375 A CN104818375 A CN 104818375A CN 201510270449 A CN201510270449 A CN 201510270449A CN 104818375 A CN104818375 A CN 104818375A
- Authority
- CN
- China
- Prior art keywords
- flange
- cooling
- strenthen
- toughening
- processing method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The invention provides a heat treatment process for strengthening and toughening large wind power flange forgings. The heat treatment process comprises the following steps: 1) heating a forged flange to the range of 650+/-10 DEG C at a low rate and preserving heat for 1-2 hours; heating the flange to the range of 910+/-10 DEG C at a high rate and preserving heat; performing forced cooling on the flange until the surface temperature is below 300 DEG C; cooling the flange below 300 DEG C and charging for tempering, and increasing the temperature to 600 DEG C and preserving heat; tapping off the flange and cooling in air to a room temperature. As a result, the strength, the tenacity and the non-deformability of the flange forgings can be effectively improved.
Description
Technical field
The present invention relates to flange technical field of heat treatment, especially relate to a kind of large-scale wind electricity flange forge piece strenthen-toughening mechanizm processing method.
Background technology
The central link part of the wind-power generating unit tower of more than 100 meters can be reached as tower height, flange needs to bear multiple load at height in the air, and stressing conditions is very complicated, especially in inclement weather, as extreme low temperature, typhoon, sand and dust, under the acting in conjunction of moving load when vane rotary of the pylon of Wind turbines and random separate loading, the safe operation of Wind turbines component will face serious test.Therefore, in order to prevent down the appearance of the security incidents such as tower, designing unit is very high for the parameter request such as mechanical property, interior tissue state, processing performance, low-temperature flexibility of wind power flange.
The thermal treatment of large-scale wind electricity flange generally adopts conventional normalizing process process, forging ferritic structure content after completing according to this conventional normalizing thermal treatment is high, the low strength of forging, through detecting, intensity level is generally close to the lower limit (accompanying drawing 4 is shown in metallographic structure) of technical requirements.
Summary of the invention
The object of the invention is to change that prior art medium-and-large-sized wind power flange ferritic structure content is high, the defect of forging low strength, a kind of heat treatment mode of flange forge piece highly malleablized is provided, the technical approach adopted is: a kind of large-scale wind electricity flange forge piece strenthen-toughening mechanizm processing method, is characterized in that: described heat-treatment technology method comprises the following steps:
1) will forge rear flange slow heat to 650 DEG C ± 10 DEG C and be incubated 1-2 hour, described slow heat refers to that heating temperature rise speed is less than or equal to 100 DEG C/h;
2) described flange quickly heats up to 910 DEG C ± 10 DEG C and is incubated, and described rapid heating refers to that temperature rise speed is greater than 150 DEG C/h, and soaking time calculates according to flange outer diameter, and account form is 1.5min/mm;
3) described flange is forced to be cooled to surface temperature below 300 DEG C;
4) shove charge tempering after described flange is cooled to less than 300 DEG C, be warming up to 600 DEG C of insulations, soaking time calculates according to flange net thickness, and account form is 1.8min/mm, and heat-up rate is less than or equal to 150 DEG C/h;
5) described flange come out of the stove after air cooling to room temperature.
Technical scheme of the present invention also have: described flange material therefor for fine grained structural steel can be welded, described structure iron CEV≤0.43.
Technical scheme of the present invention also has: described flange material therefor is low-alloy high-tensile structural steel steel.
Technical scheme of the present invention also has: described pressure cooling refers to the employing blowing air cooling mode when cooling.
Technical scheme of the present invention also has: described pressure cooling refers to the employing spray cooling mode when cooling.
Beneficial effect of the present invention is: 1) thermal treatment of this large-sized flange forging adopts the mode of zone heating to carry out, less than 650 DEG C slow heat, with the temperature stress avoiding forging surface to cause greatly with the heart portion temperature difference, more than the 650 DEG C modes adopting full power rapid heating, to make forging quickly through transformation temperature, improve forging superheating temperature, add austenite nucleation rate, and from reaching the effect of crystal grain thinning; Have employed blowing, spraying etc. during cooling and force control refrigeration technique, accelerate forging speed of cooling, after forcing to be cooled to surface temperature 300 DEG C, shove charge tempering, air cooling of coming out of the stove after tempering insulation; Specially designed heat-up rate and the type of cooling, make this thermal treatment be different from traditional thermal treatment process; The mode of cooling is forced to inhibit pro-eutectoid phase---ferritic precipitation, ferritic content is relatively low, pearlitic content is relatively high, and because perlite hardness ratio ferrite wants high, therefore the intensity of forging and toughness are improved (accompanying drawing 3 is shown in metallographic structure).
2) adopt the flange forge piece after technical solution of the present invention process, its internal grain degree can reach more than 8 grades, and crystal grain is thin, crystal boundary is many, impurity is lower at grain boundaries segregation relative concentration, thus effectively improves forging intensity and low-temperature flexibility, and reduces the Cold Brittleness Transition Temperature of steel.
3) the flange forge piece intensity compliance rate more than 99.5% after technical solution of the present invention process is adopted, and most of strength values all limit values in technological standard requires, low-temperature impact toughness-50 DEG C of ballistic works reach more than 100 joules, obdurability coupling is very good, can meet more than 100 meters pylons completely and connect needs.
4) flange forge piece after adopting technical solution of the present invention to come out of the stove, owing to have passed through high tempering process, stabilizes metallographic structure, and eliminate the stress that structural transformation produces, therefore forging also has not yielding advantage.
Accompanying drawing explanation
Accompanying drawing 1 is normalizing process graphic representation in thermal treatment of the present invention, accompanying drawing 2 is tempering process graphic representations in thermal treatment process of the present invention, accompanying drawing 3 is after adopting thermal treatment process of the present invention, the flange metallographic structure figure (magnification is 200 times) obtained, accompanying drawing 4 is metallographic structure figure (magnification is 200 times) after the conventional normalizing process process of employing.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described.The invention discloses a kind of large-scale wind electricity flange forge piece strenthen-toughening mechanizm processing method, this heat-treatment technology method comprises the following steps:
1) will forge rear flange slow heat to 650 DEG C ± 10 DEG C and be incubated 1-2 hour, slow heat refers to that heating temperature rise speed is less than or equal to 100 DEG C/h;
2) flange quickly heats up to 910 DEG C ± 10 DEG C and is incubated, and rapid heating refers to that temperature rise speed is greater than 150 DEG C/h, and soaking time calculates according to flange net thickness, and account form is 1.5min/mm;
3) flange is forced to be cooled to surface temperature below 300 DEG C;
4) shove charge tempering after flange is cooled to less than 300 DEG C, be warming up to 600 DEG C of insulations, soaking time calculates according to flange net thickness, and account form is 1.8min/mm, and heat-up rate is less than or equal to 150 DEG C/h;
5) flange come out of the stove after air cooling to room temperature.
The net thickness of flange refers to: the height of flange or (external diameter-internal diameter)/2, and the smaller value in both getting is as net thickness.
This flange material therefor is for can weld fine grained structural steel, and this structure iron CEV≤0.43, also can select low-alloy high-tensile structural steel.
Cooling is wherein forced to refer to employing blowing air cooling mode or spray cooling mode when cooling.
The metallographic structure of display in accompanying drawing 3 and accompanying drawing 4 is compared, after adopting present invention process, the content of ferrite (accompanying drawing 3 and accompanying drawing 4 in white portion) is obviously less than normative heat treatment technique, the content ratio of perlite (accompanying drawing 3 and black part in accompanying drawing 4) is relative high, because pearlitic hardness, intensity are higher than ferrite, therefore under present invention process, the over-all properties of flange is effectively improved, and under present invention process, flange crystal grain is more tiny than crystal grain under normative heat treatment, also makes flange over-all properties get a promotion.
Certainly, above-mentioned explanation is not limitation of the present invention, and the present invention is also not limited only to above-mentioned citing, and the change that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also belong to protection scope of the present invention.
Claims (5)
1. a large-scale wind electricity flange forge piece strenthen-toughening mechanizm processing method, is characterized in that: described heat-treatment technology method comprises the following steps:
1) will forge rear flange slow heat to 650 DEG C ± 10 DEG C and be incubated 1-2 hour, described slow heat refers to that heating temperature rise speed is less than or equal to 100 DEG C/h;
2) described flange quickly heats up to 910 DEG C ± 10 DEG C and is incubated, and described rapid heating refers to that temperature rise speed is greater than 150 DEG C/h, and soaking time calculates according to flange net thickness, and account form is 1.5min/mm;
3) described flange is forced to be cooled to surface temperature below 300 DEG C;
4) shove charge tempering after described flange is cooled to less than 300 DEG C, be warming up to 600 DEG C of insulations, soaking time calculates according to flange net thickness, and account form is 1.8min/mm, and heat-up rate is less than or equal to 150 DEG C/h;
5) described flange come out of the stove after air cooling to room temperature.
2., according to large-scale wind electricity flange forge piece strenthen-toughening mechanizm processing method according to claim 1, it is characterized in that: described flange material therefor for fine grained structural steel can be welded, described structure iron CEV≤0.43.
3., according to large-scale wind electricity flange forge piece strenthen-toughening mechanizm processing method according to claim 1, it is characterized in that: described flange material therefor is low-alloy high-tensile structural steel steel.
4. according to large-scale wind electricity flange forge piece strenthen-toughening mechanizm processing method according to claim 1, it is characterized in that: described pressure cooling refers to the employing blowing air cooling mode when cooling.
5. according to large-scale wind electricity flange forge piece strenthen-toughening mechanizm processing method according to claim 1, it is characterized in that: described pressure cooling refers to the employing spray cooling mode when cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510270449.4A CN104818375A (en) | 2015-05-26 | 2015-05-26 | Heat treatment process for strengthening and toughening large wind power flange forgings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510270449.4A CN104818375A (en) | 2015-05-26 | 2015-05-26 | Heat treatment process for strengthening and toughening large wind power flange forgings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104818375A true CN104818375A (en) | 2015-08-05 |
Family
ID=53728854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510270449.4A Pending CN104818375A (en) | 2015-05-26 | 2015-05-26 | Heat treatment process for strengthening and toughening large wind power flange forgings |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104818375A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111299495A (en) * | 2020-03-11 | 2020-06-19 | 伊莱特能源装备股份有限公司 | Green forging process method for transition section |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102513799A (en) * | 2012-01-06 | 2012-06-27 | 山东伊莱特重工有限公司 | Ring rolling method for flange of megawatt wind generation set tower |
| CN102703818A (en) * | 2012-06-11 | 2012-10-03 | 张家港海陆环形锻件有限公司 | Material for overweight ring forging and manufacturing process for ring forging |
| CN103740914A (en) * | 2013-10-28 | 2014-04-23 | 张家港海锅重型锻件有限公司 | Production process of 410 steel forge piece for deep-sea oil production equipment |
| CN103952646A (en) * | 2014-05-05 | 2014-07-30 | 莱芜钢铁集团有限公司 | Low-temperature resistant low-alloy structural steel and preparation method thereof |
| CN104017966A (en) * | 2014-04-28 | 2014-09-03 | 张家港海锅重型锻件有限公司 | Production process of F22 steel forged piece for deep sea explosion-roof device |
-
2015
- 2015-05-26 CN CN201510270449.4A patent/CN104818375A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102513799A (en) * | 2012-01-06 | 2012-06-27 | 山东伊莱特重工有限公司 | Ring rolling method for flange of megawatt wind generation set tower |
| CN102703818A (en) * | 2012-06-11 | 2012-10-03 | 张家港海陆环形锻件有限公司 | Material for overweight ring forging and manufacturing process for ring forging |
| CN103740914A (en) * | 2013-10-28 | 2014-04-23 | 张家港海锅重型锻件有限公司 | Production process of 410 steel forge piece for deep-sea oil production equipment |
| CN104017966A (en) * | 2014-04-28 | 2014-09-03 | 张家港海锅重型锻件有限公司 | Production process of F22 steel forged piece for deep sea explosion-roof device |
| CN103952646A (en) * | 2014-05-05 | 2014-07-30 | 莱芜钢铁集团有限公司 | Low-temperature resistant low-alloy structural steel and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 莫之民 等: "《热处理工艺及设备计算》", 30 April 1995, 上海交通大学出版社 * |
| 钱显毅 等: "《风能及太阳能发电技术》", 31 December 2013, 北京交通大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111299495A (en) * | 2020-03-11 | 2020-06-19 | 伊莱特能源装备股份有限公司 | Green forging process method for transition section |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102851479B (en) | Heat treatment technology of high-strength bolt | |
| CN102380565B (en) | Method for forging large forging | |
| CN102994710B (en) | Spheroidizing annealing process of superplasticity fastener wire rod | |
| CN104946870A (en) | Heat treatment method for strength of 28CrMoNiV steel capable of improving industrial steam turbine rotor forge piece | |
| CN109082587A (en) | The manufacturing method of high-carbon high nickel steel ring forging used for wind power generation | |
| CN106435332A (en) | Manufacturing method for 40CrNiMoA medium-carbon alloy steel wind power main shaft of low wind speed wind power unit | |
| CN104593573A (en) | Combined thermomechanical treatment strengthening method for efficiently improving strength and toughness of non-quenched and tempered steel | |
| CN100371467C (en) | Ingot slow cool annealing process for low-carbon steel | |
| CN107299204A (en) | A kind of processing method of raising 20CrMnMo hardness of steel | |
| CN101899556A (en) | Heat treatment method for thinning coarse grains of ferrite refractory steel for bearing pressure at high temperature | |
| CN103789520B (en) | At the uniform velocity heat-eliminating medium and the application after forging in controlled cooling model process thereof | |
| CN101831535B (en) | Heat treatment method after forging of ultra-supercritical high and medium pressure rotor steel | |
| CN102605147A (en) | Method for carrying out normalizing heat treatment by using waste heat from forging of forged piece | |
| CN104561462B (en) | A kind of bainite and martensite Multiphase Steel/iron progressive austempering heat treatment method and device | |
| CN106435404A (en) | Low wind speed wind power unit low-carbon alloy steel wind power main shaft manufacturing method | |
| CN104962705A (en) | Isothermal normalizing treatment technique of wind power flange | |
| CN101892373A (en) | Heat treatment technology for low-temperature high impact toughness medium-thickness steel plate | |
| CN106425285A (en) | 34CrNiMo6 wind power main shaft forging forming method for low wind speed wind turbine set | |
| CN104805264A (en) | Heat treatment method for 15NiCuMoNb5 steel pipe | |
| CN105018712A (en) | Spheroidizing annealing process of superplastic medium carbon steel wire | |
| CN104818375A (en) | Heat treatment process for strengthening and toughening large wind power flange forgings | |
| CN103614521B (en) | Medium carbon steel material large diesel engine output shaft tempering process | |
| CN115927805B (en) | Heat treatment method for improving grain size of 10Cr11Co3W3NiMoVNbNB martensitic stainless steel forging | |
| CN101736139B (en) | Organization control method of large-size pre-hardening type plastic die steel module | |
| CN103993141A (en) | Spheroidizing annealing process for high-toughness medium carbon steel wires |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: Guanzhuang town Zhangqiu city Ji'nan City, Shandong province 250207 Ji Wang Road No. 9001 Applicant after: SHANDONG IRAETA HEAVY INDUSTRY CO., LTD. Address before: 250207 Zhangqiu, Shandong Province, Wang Ji Road, No. 9001, No. Applicant before: Shandong Iraeta Heavy Industry Co., Ltd. |
|
| COR | Change of bibliographic data | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150805 |